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$ pip install pysed --upgrade

uninstall

$ pip uninstall pysed

Usage: pysed [OPTION] {patt} {repl} {lines/max/flag} [[input-file], --write]

pysed is utility that parses and transforms text

Optional arguments:
  -h, --help            Print this help message and exit
  -v, --version         Print program version and exit
  -r, --replace         Search and replace text
  -f, --findall         Find all from pattern in text
  -s, --search          Search for the first matching
  -m, --match           Pattern matching in the beginning
  -l, --lines           Search pattern and print lines
  -g, --highlight       Highlight and print text
  -t, --stat            Print text statistics
      --write           Write changes to file

$ cat text.txt
This is my cat,
 whose name is Betty.
This is my dog,
 whose name is Frank.
This is my fish,
 whose name is George.
This is my goat,
 whose name is Adam.

Replace text:

$ pysed -r "name" "surname" text.txt
This is my cat,
 whose surname is Betty.
This is my dog,
 whose surname is Frank.
This is my fish,
 whose surname is George.
This is my goat,
 whose surname is Adam.

Replace text in specific lines:

$ pysed -r "name" "surname" 2,4 text.txt
This is my cat,
 whose surname is Betty.
This is my dog,
 whose surname is Frank.
This is my fish,
 whose name is George.
This is my goat,
 whose name is Adam.

Replace text in specific lines and max:

$ pysed -r "is" "IS" 1,7/1 text.txt
ThIS is my cat,
 whose surname is Betty.
This is my dog,
 whose surname is Frank.
This is my fish,
 whose name is George.
ThIS is my goat,
 whose name is Adam.

Add character to the beginning of each line:

$ pysed -r "^" "# " text.txt
# This is my cat,
#  whose name is Betty.
# This is my dog,
#  whose name is Frank.
# This is my fish,
#  whose name is George.
# This is my goat,
#  whose name is Adam.

Add character to the end of each line:

$ pysed -r "$" " #" text.txt
This is my cat, #
 whose name is Betty. #
This is my dog, #
 whose name is Frank. #
This is my fish, #
 whose name is George. #
This is my goat, #
 whose name is Adam. #

Find all matching pattern:

$ pysed -f "name " text.txt
name name name name

Find all matching pattern in specific lines:

$ pysed -f "name " "" 2,4 text.txt
name name

Search and print lines:

$ pysed -l "name" text.txt
- This is my cat,
2  whose name is Betty.
- This is my dog,
4  whose name is Frank.
- This is my fish,
6  whose name is George.
- This is my goat,
8  whose name is Adam.

Highlight text:

$ pysed -g "name" "red" text.txt
This is my cat,
 whose name is Betty.
This is my dog,
 whose name is Frank.
This is my fish,
 whose name is George.
This is my goat,
 whose name is Adam.

Print statics text:

$ pysed -t text.txt
Lines: 8, Words: 32, Chars: 125, Blanks: 27

Use the argument "--write" in any case when you want to save the changes:

$ pysed -r "name" "surname" text.txt --write


Use as piping:

$ echo "This is my cat, whose name is Betty" | pysed -r "cat" "dog"
This is my dog, whose name is Betty

$ repl="fish"
$ echo "This is my cat, whose name is Betty" | pysed -r "cat" $repl
This is my fish, whose name is Betty

$ echo "This is my cat, whose name is Betty" | pysed -r "[^\W]+" "-"
- - - -, - - - -

$ echo "This is my cat, whose name is Betty" | pysed -r "is" "IS" 1/1
ThIS is my cat, whose name is Betty

$ echo "910a13de57dfbdf6f06675db975f8407" | pysed -r "[^\d+]"
91013576066759758407

$ echo "910a13de57dfbdf6f06675db975f8407" | pysed -f "\d+"
910 13 57 6 06675 975 8407

$ echo "910a13de57dfbdf6f06675db975f8407" | pysed -s "\d+"
910

$ echo "910a13de57dfbdf6f06675db975f8407" | pysed -s "(\d+)(\w+)" "" 0/1
910

$ echo "910a13de57dfbdf6f06675db975f8407" | pysed -s "(\d+)(\w+)" "" 0/2
a13de57dfbdf6f06675db975f8407

$ echo "The temperature today is at +12 degrees Celsius" | pysed -s ".\d+"
+12

$ echo "/usr/local/bin" | pysed -r "/local" ""
/usr/bin

$ echo "/usr/local/bin" | pysed -r "/LoCal" "" //IGNORECASE
/usr/bin

Use with command "find". You can use "find" and "pysed" commands in combination to find
and replace text in multiple files. For example:

$ find . -name *.py -exec pysed -r "lefttext" "righttext" {} --write \;

this command finds 'lefttext' string in all python files and replace it with 'righttext'.